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The transmitter is an intentional radiator and subject to certification. Testing will need to be performed by an accredited laboratory per the regulations for the frequency band of operation. Usually the test lab can adjust the transmitter output power to get to the maximum legal limit as a part of the testing. This is beneficial since the board layout, antenna, and product construction all affect the radiation, so it is generally not possible to calculate the maximum power output ahead of time. In most cases it is not necessary to be present for testing and the laboratory will prepare the filing paperwork. Certifications were once issued by the FCC directly, but now independent laboratories are allowed to issue certification though the Telecommunication Certification Body (TCB) program which has greatly streamlined the process. Following successful testing, a report is produced showing information about the testing and the device. A label displaying the applicant’s FCC ID number along with FCC prescribed information will need to be placed on the certified product. An exception to this is RF modules that have been pre-certified under the modular approval process. In these cases, the transmitter is already tested and approved, the end product just needs to be labeled with the ID number of the included transmitter.
